Mechanical Properties of concrete with Silica Fume and Partial Replacement of Coarse Aggregate by Steel Slag

Abstract: Our natural resources are depleting and alternative materials as partial replacement would provide better strength and eco-friendly concrete having low CO2 foot print. Silica fume as mineral admixture in partial replacement of cement with different percentages of 0, 5,7.5 and 12.5% by weight of cement and to protect the natural sources like coarse aggregates, we are partially replacing coarse aggregates by steel slag of 0 ,10,20,30,40,50 and 60% by weight. In this study, concrete cubes and cylinders were casted by replacing cement alone with silica fume and coarse aggregates alone by steel slag and as well as combinations of optimum partial replacements of cement and coarse aggregate at a time. At 7.5% the optimum compressive strength with partial replacement of cement with silica fume and at 40% the optimum compressive strength with partial replacement of coarse aggregate with steel slag is achieved.

Keywords: - Compressive strength, Silica fume, Steel slag aggregates, Split tensile strength.